The geotechnical restrictions for an urban waste disposal in the Granada basin are considered. A ... more The geotechnical restrictions for an urban waste disposal in the Granada basin are considered. A geotechnical detailed mapping and a number of “in situ” infiltrometer measures of permeability showed the abundance of sandy silts and sands with minor amounts of gravel and clay in the selected site. The inapropiate range of permeability of the predominant soils and the lacking of clay soils to improve by compaction the layers around the wastes lead to the selection of nearer areas in which marls and clays are dominant.
Landslide description, terminology, classification, inventory and mapping; Landsliding effects an... more Landslide description, terminology, classification, inventory and mapping; Landsliding effects and consequences; Landsliding causes: Determining and triggering factors; Slope stability and failure analysis: Traitment and control; Landslide distribution, susceptibility, hazard and risk mapping and assessment; etc. 44 papers. This book is intended for engineering geologists, physical geographers, geologists, geomorphologists, engineers, students and professionals interested in the environmental incidence of landslides as one of the natural hazards.
ABSTRACT In this work, a simple methodology is presented for processing high-resolution topograph... more ABSTRACT In this work, a simple methodology is presented for processing high-resolution topographical data over wide areas. It is based on digital elevation model of differences (DEMoD) among high-resolution digital models (HRDEM) produced from lightdetection and ranging (LiDAR) data. Because these qualitative approaches based on HRDEMs can be affected by errors related to misalignment between different passes of the airborne sensor and errors in classifying points, a simplified strategy was undertaken for their semi-automatic correction and supervision for analyzing geomorphological changes. Besides, it became possible to detect, delineate, and classify a total of 47 natural landslides and 50 slope-cut failures over an area of 234km2 on the basis of the analysis of the LiDAR products (DEMs and DEMoD) and the orthophotography imagery inspection integrated in a geographical information system (GIS). Most of the displacements detected were probably generated during the winter of 2009–2010 when a new record of cumulative rainfall was reached. The displacement rate of these movements cannot be known with precision, but the minimum velocity that can be obtained is 0.3m/year regarding the period between the two data acquisitions carried out in November 2008 and July 2010. On the other hand, a comparison was made of the existing susceptibility maps with respect to this new inventory, which indicated greater landslide frequency in areas of moderate susceptibility levels. The influence of treating inventories at different temporal scales is discussed.
EGU General Assembly Conference Abstracts, Apr 1, 2009
Landslide susceptibility in a Mediterranean mountain environment, southern slope of Sierra Nevada... more Landslide susceptibility in a Mediterranean mountain environment, southern slope of Sierra Nevada, is analyzed. In the study area of 460 km2, 252 landslides were inventoried affecting a 3,2% of the total area. These landslides comprising mainly slides and flows on phyllites, schist and marble units in the Inner Zone of the Betic Cordillera, with colluvial, alluvial or scree deposits, along
SUMMARYThe aim of this study was to construct risk maps for the presence of the dominantLeishmani... more SUMMARYThe aim of this study was to construct risk maps for the presence of the dominantLeishmania infantumvector,P. perniciosus,and check its usefulness (a) to predict the risk of canine leishmaniasis and (b) to define effective leishmaniasis control measures. We obtained data for the presence/absence ofP. perniciosusat 167 sampling sites in southern Spain, from which we also took a series of ecological and climate-related data. The probability ofP. perniciosuspresence was estimated as a function of these environmental variables and generated spatial risk maps. Altitude, land use and drainage hole features (with or without PVC piping) were retained as the only predictors for the distribution of this vector species. Drainage hole features in retaining walls, with or without PVC piping, produce significant variations in the probability ofP. perniciosuspresence, varying from 2·3 to 91·8% if PVC piping is absent and from 0·4 to 66·5% if all holes have PVC piping. It was concluded that the use of PVC piping in drainage holes could help to reduce leishmaniasis transmission.
In the procedures to minimize diachronic landslides, data on their temporal evolution and destruc... more In the procedures to minimize diachronic landslides, data on their temporal evolution and destructive capacities are necessary. For that purpose, remote-detection techniques proved to be highly useful for quantifying the ongoing change in the relief, as well as in comparisons between digital terrain models achieved by Light Detection and Ranging. The methodology presented in this paper includes the supervised merging and comparison of sequential scans, acquired within nearly annual intervals from an irregular terrain, which improves the quality of the results highlighting ground changes. This approach is based on the processing of digital terrain models from point clouds acquired by Terrestrial Laser Scanning to quantify and interpret the landslide displacements. In parallel, it is supported by Global Navigation Satellite Systems, the use of artificial targets and a refined data processing to minimize the uncertainty and improve the precision of the results. This is applied to a large translational slide affecting phyllite rocks in a IV-V degree of weathering settled on the southern slope of Sierra Nevada (south-eastern Spain). During the monitoring period (2008–2010), the slide remained inactive until 2009, followed by a reactivation with displacements in the range −1.80 to 1.20 m along the period 2009–2010, where negative values are downwards from the reference model (2009). The accumulated relative standard deviation between data sets was on the order of 7.5 cm, whereas the threshold to determine a terrain displacement (also avoiding changes due to erosion-accumulation processes) was of 10 cm. When applying this methodology to Airborne Laser Scanning datasets for the years 2008 and 2010, covering zones hidden to the line of sight of the terrestrial technique, a reactivation with similar deformation pattern was found useful to validate the findings, although the detail of changes and quantitative results did not match exactly due to the different accuracy and resolution of both techniques. The reactivation of the slide coincided with a period of intense rains, pointing to this as the triggering factor, with a precipitation threshold of roughly 1000 mm in a period of 4 months, only reached on one occasion throughout in the historical record.
Resumen: Se analiza un inventario de 281 movimientos de ladera observados en series margoso arcil... more Resumen: Se analiza un inventario de 281 movimientos de ladera observados en series margoso arcillosas y carbonatadas del Subbético y la relación entre la distribución de las zonas de ruptura y la pendiente, tipos de litologia y exposición de las vertientes. Los ...
... C. UREÑA(1), JM AZAÑÓN(1,2), JM CARO(1), C. IRIGARAY(3), F. CORPAS(4), A. RAMÍREZ(5), F. RIVA... more ... C. UREÑA(1), JM AZAÑÓN(1,2), JM CARO(1), C. IRIGARAY(3), F. CORPAS(4), A. RAMÍREZ(5), F. RIVAS(5), LM SALAZAR(5) AND I. MOCHÓN(6) ... Science, 13:219-230. Eren, S. and Filiz, M. (2009): Comparing the conventional soil stabilization methods to the consolid ...
A methodology is proposed for mapping susceptibility to landsliding and validating the results. H... more A methodology is proposed for mapping susceptibility to landsliding and validating the results. Heavy rains in late 1996 and early 1997 led to a large number of landslides in the Rute sector (Co rdoba, Southern Spain), where landslide susceptibility mapping had previously been carried out using a `matrix ' method developed with a Geographical Information System (GIS). Analysis of the distribution of the new landslides (or reactivated earlier ones) enabled the methodology to be validated by calculating association coefficients and determining the closeness of the match between subsequent field evidence and the previously defined susceptibility levels. From the data obtained, it can be concluded that the susceptibility mapping effectively explained the spatial distribution of landslides, thus providing valuable information on stability conditions over a widespread area. Copyright # 1999 John Wiley & Sons, Ltd. KEY WORDS: landslides; susceptibility validation; GIS; Co rdoba; Spain
The geotechnical restrictions for an urban waste disposal in the Granada basin are considered. A ... more The geotechnical restrictions for an urban waste disposal in the Granada basin are considered. A geotechnical detailed mapping and a number of “in situ” infiltrometer measures of permeability showed the abundance of sandy silts and sands with minor amounts of gravel and clay in the selected site. The inapropiate range of permeability of the predominant soils and the lacking of clay soils to improve by compaction the layers around the wastes lead to the selection of nearer areas in which marls and clays are dominant.
Landslide description, terminology, classification, inventory and mapping; Landsliding effects an... more Landslide description, terminology, classification, inventory and mapping; Landsliding effects and consequences; Landsliding causes: Determining and triggering factors; Slope stability and failure analysis: Traitment and control; Landslide distribution, susceptibility, hazard and risk mapping and assessment; etc. 44 papers. This book is intended for engineering geologists, physical geographers, geologists, geomorphologists, engineers, students and professionals interested in the environmental incidence of landslides as one of the natural hazards.
ABSTRACT In this work, a simple methodology is presented for processing high-resolution topograph... more ABSTRACT In this work, a simple methodology is presented for processing high-resolution topographical data over wide areas. It is based on digital elevation model of differences (DEMoD) among high-resolution digital models (HRDEM) produced from lightdetection and ranging (LiDAR) data. Because these qualitative approaches based on HRDEMs can be affected by errors related to misalignment between different passes of the airborne sensor and errors in classifying points, a simplified strategy was undertaken for their semi-automatic correction and supervision for analyzing geomorphological changes. Besides, it became possible to detect, delineate, and classify a total of 47 natural landslides and 50 slope-cut failures over an area of 234km2 on the basis of the analysis of the LiDAR products (DEMs and DEMoD) and the orthophotography imagery inspection integrated in a geographical information system (GIS). Most of the displacements detected were probably generated during the winter of 2009–2010 when a new record of cumulative rainfall was reached. The displacement rate of these movements cannot be known with precision, but the minimum velocity that can be obtained is 0.3m/year regarding the period between the two data acquisitions carried out in November 2008 and July 2010. On the other hand, a comparison was made of the existing susceptibility maps with respect to this new inventory, which indicated greater landslide frequency in areas of moderate susceptibility levels. The influence of treating inventories at different temporal scales is discussed.
EGU General Assembly Conference Abstracts, Apr 1, 2009
Landslide susceptibility in a Mediterranean mountain environment, southern slope of Sierra Nevada... more Landslide susceptibility in a Mediterranean mountain environment, southern slope of Sierra Nevada, is analyzed. In the study area of 460 km2, 252 landslides were inventoried affecting a 3,2% of the total area. These landslides comprising mainly slides and flows on phyllites, schist and marble units in the Inner Zone of the Betic Cordillera, with colluvial, alluvial or scree deposits, along
SUMMARYThe aim of this study was to construct risk maps for the presence of the dominantLeishmani... more SUMMARYThe aim of this study was to construct risk maps for the presence of the dominantLeishmania infantumvector,P. perniciosus,and check its usefulness (a) to predict the risk of canine leishmaniasis and (b) to define effective leishmaniasis control measures. We obtained data for the presence/absence ofP. perniciosusat 167 sampling sites in southern Spain, from which we also took a series of ecological and climate-related data. The probability ofP. perniciosuspresence was estimated as a function of these environmental variables and generated spatial risk maps. Altitude, land use and drainage hole features (with or without PVC piping) were retained as the only predictors for the distribution of this vector species. Drainage hole features in retaining walls, with or without PVC piping, produce significant variations in the probability ofP. perniciosuspresence, varying from 2·3 to 91·8% if PVC piping is absent and from 0·4 to 66·5% if all holes have PVC piping. It was concluded that the use of PVC piping in drainage holes could help to reduce leishmaniasis transmission.
In the procedures to minimize diachronic landslides, data on their temporal evolution and destruc... more In the procedures to minimize diachronic landslides, data on their temporal evolution and destructive capacities are necessary. For that purpose, remote-detection techniques proved to be highly useful for quantifying the ongoing change in the relief, as well as in comparisons between digital terrain models achieved by Light Detection and Ranging. The methodology presented in this paper includes the supervised merging and comparison of sequential scans, acquired within nearly annual intervals from an irregular terrain, which improves the quality of the results highlighting ground changes. This approach is based on the processing of digital terrain models from point clouds acquired by Terrestrial Laser Scanning to quantify and interpret the landslide displacements. In parallel, it is supported by Global Navigation Satellite Systems, the use of artificial targets and a refined data processing to minimize the uncertainty and improve the precision of the results. This is applied to a large translational slide affecting phyllite rocks in a IV-V degree of weathering settled on the southern slope of Sierra Nevada (south-eastern Spain). During the monitoring period (2008–2010), the slide remained inactive until 2009, followed by a reactivation with displacements in the range −1.80 to 1.20 m along the period 2009–2010, where negative values are downwards from the reference model (2009). The accumulated relative standard deviation between data sets was on the order of 7.5 cm, whereas the threshold to determine a terrain displacement (also avoiding changes due to erosion-accumulation processes) was of 10 cm. When applying this methodology to Airborne Laser Scanning datasets for the years 2008 and 2010, covering zones hidden to the line of sight of the terrestrial technique, a reactivation with similar deformation pattern was found useful to validate the findings, although the detail of changes and quantitative results did not match exactly due to the different accuracy and resolution of both techniques. The reactivation of the slide coincided with a period of intense rains, pointing to this as the triggering factor, with a precipitation threshold of roughly 1000 mm in a period of 4 months, only reached on one occasion throughout in the historical record.
Resumen: Se analiza un inventario de 281 movimientos de ladera observados en series margoso arcil... more Resumen: Se analiza un inventario de 281 movimientos de ladera observados en series margoso arcillosas y carbonatadas del Subbético y la relación entre la distribución de las zonas de ruptura y la pendiente, tipos de litologia y exposición de las vertientes. Los ...
... C. UREÑA(1), JM AZAÑÓN(1,2), JM CARO(1), C. IRIGARAY(3), F. CORPAS(4), A. RAMÍREZ(5), F. RIVA... more ... C. UREÑA(1), JM AZAÑÓN(1,2), JM CARO(1), C. IRIGARAY(3), F. CORPAS(4), A. RAMÍREZ(5), F. RIVAS(5), LM SALAZAR(5) AND I. MOCHÓN(6) ... Science, 13:219-230. Eren, S. and Filiz, M. (2009): Comparing the conventional soil stabilization methods to the consolid ...
A methodology is proposed for mapping susceptibility to landsliding and validating the results. H... more A methodology is proposed for mapping susceptibility to landsliding and validating the results. Heavy rains in late 1996 and early 1997 led to a large number of landslides in the Rute sector (Co rdoba, Southern Spain), where landslide susceptibility mapping had previously been carried out using a `matrix ' method developed with a Geographical Information System (GIS). Analysis of the distribution of the new landslides (or reactivated earlier ones) enabled the methodology to be validated by calculating association coefficients and determining the closeness of the match between subsequent field evidence and the previously defined susceptibility levels. From the data obtained, it can be concluded that the susceptibility mapping effectively explained the spatial distribution of landslides, thus providing valuable information on stability conditions over a widespread area. Copyright # 1999 John Wiley & Sons, Ltd. KEY WORDS: landslides; susceptibility validation; GIS; Co rdoba; Spain
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